make _tex global var

Author: lukas-staab

src/LatexRenderer.php

@@ -123,7 +123,7 @@ public function renderPdf(string $templateName, array $variables, array $files =
                     'template' => $templateName,
                 ],
             ];
-            $variables = array_merge($latexVars, $variables);
+            $this->twig->addGlobal('_tex', $latexVars);
             $tex = $this->twig->render($templateName . '.tex.twig', $variables);
 
             file_put_contents($this->tmpDir . "tex/$templateName/$uid/main.tex", $tex);

src/PdfFilterExtension.php

@@ -4,6 +4,7 @@
 
 use Symfony\Component\Process\ExecutableFinder;
 use Symfony\Component\Process\Process;
+use Twig\Error\RuntimeError;
 use Twig\TwigFilter;
 
 class PdfFilterExtension extends \Twig\Extension\AbstractExtension
@@ -27,13 +28,17 @@ public function getFilters(): array
      * @param array $context all variables
      * @param string $relFilePath only the filename, no path is needed. Directory is taken as _tex.dir/files/
      * @return int|null returns null if file does not exist, int with number of pages otherwise
+     * @throws RuntimeError
      */
     public function pages(array $context, $relFilePath): ?int
     {
+        if (!isset($context['_tex']['dir'])) {
+            throw new RuntimeError('_tex is not visible in this context');
+        }
         $dir = $context['_tex']['dir'];
         $file = $dir . $relFilePath;
         if (!file_exists($file)) {
-            return null;
+            throw new RuntimeError('File does not exist');
         }
         if (!empty($this->qpdf)) {
             $p = new Process(['qpdf', '--show-npages', $file]);